Import a missing python module
Add comment/readme

Change-Id: Ia841b5226b948297f0c0d4adfca0a1acbadf661c
diff --git a/docker/docker-compose.yml b/docker/docker-compose.yml
index 6a6dc38..f62365c 100644
--- a/docker/docker-compose.yml
+++ b/docker/docker-compose.yml
@@ -33,7 +33,7 @@
 
     airflow:
         # image: opencord/cord-workflow-airflow
-        image: cord-workflow-airflow:0.5.2
+        image: opencord/cord-workflow-airflow:0.5.3
         restart: always
         depends_on:
             - postgres